It depends on what you want your pump to do. Do you just want it to return your water from your sump or do you want it to provide your "turbulent" current in your tank. If the first then the Mag 3 would be great, if you want to use it to move your water alot more then I'd go with the Mag 5 or larger. Remember, just a couple of 90degree elbows will really reduce your water flow, and of course, head pressure will as well.
Doug
|